摘要
为了对候选光敏剂竹红菌甲素(HA)进行改性并保持其优异的敏化特性,对HA的光谱特性和激发态性质作了进一步的指认。系统研究了HA在不同液相体系下的吸收和荧光光谱,对指认HA的光谱和电子跃迁的机制提出了新的依据,结果表明,吸收带I产生于π-π*跃迁,吸收带Ⅱ和Ⅲ产生于P-π共轭所导致的L→aπ跃迁的电子振动结构;荧光发射带I和Ⅱ是产生于同一跃迁机制S1(L,aπ)→S0的正常荧光的振动结构。
In order to modify hypocrellin A （HA） while maintaining its excellent sensitivity to singlet oxygen, work has been done to recognise its spectroscopy and electronic excited state properties. New evidences are obtained to decide its spectroscopy and electronic transition mechanism, from systemmatic study of the absorption and fluorescence spectrum of HA in different acidity and basicity. Results indicate that the absorption band I results from π→π^＊ transition; the long wavelength absorption band Ⅱ and Ⅲ results from L→α, transition for the reason of P-π conjugation, and the fluorescence emission band Ⅰ and Ⅱ result from the transition of S1 （L, απ）→S0 with the similar vibronic featrues to absorption band.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2006年第6期928-932,共5页
Acta Optica Sinica
基金
天津市科学技术委员会光电子联合研究中心(003101511)资助课题。
关键词
光谱学
吸收光谱
荧光光谱
光动力疗法
竹红菌甲素
激发态分子内质子转移
spectroscopy
absorption spectrum
fluorescence spectrum
photodynamic therapy （PDT）
hypocrellin A （HA）
excited state intramolecule proton transfer （ESIPT）
